My Inquiry
My Account
NXP Semiconductors MC68HC908JK3ECDW
- Part No.:
- MC68HC908JK3ECDW
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC908JK3ECDW.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,987
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC68HC908JK3ECDW from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated 8-channel 8-bit ADC. It features a 20-pin SOIC package, internal oscillator option, and supports low-power Wait/Stop modes for battery-operated control applications such as appliance user interfaces and industrial sensor nodes.
For engineers reviewing the MC68HC908JK3ECDW datasheet, MC68HC908JK3ECDW pinout, MC68HC908JK3ECDW application, or MC68HC908JK3ECDW equivalent, key selection criteria include FLASH endurance (10k erase/write cycles), ADC conversion time (≤25 μs), IRQ/KBI interrupt latency, COP watchdog timing accuracy, and SOIC-20 thermal performance in ambient temperatures up to +85°C.
Technical Context
The MC68HC908JK3ECDW implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its System Integration Module (SIM) provides bus clock generation, reset control, and interrupt management with three priority levels and hardware vectoring.
It integrates a Timer Interface Module (TIM) with two 16-bit channels supporting input capture, output compare, and PWM generation, plus a Keyboard Interrupt Module (KBI) with configurable debounce and edge-triggered wake-up on up to 8 pins - all operating under unified low-power supervision with LVI and COP fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 8-level hardware stack |
| FLASH Memory | 4 KB on-chip FLASH with 10,000 erase/write cycles; supports in-system programming via MON ROM |
| RAM Size | 192 bytes of on-chip RAM with no external expansion interface |
| ADC Resolution | 8-bit successive-approximation ADC with 8 selectable inputs and ±1 LSB integral nonlinearity |
| Operating Voltage | 2.7–5.5 V DC supply range; LVI threshold fixed at 2.5 V nominal with hysteresis |
| Max Clock Frequency | 8 MHz bus frequency using internal RC oscillator or external crystal up to 8 MHz |
| Package Type | 20-pin SOIC (Small Outline Integrated Circuit), 0.300-inch body width, RoHS-compliant |
Pinout & Package
MC68HC908JK3ECDW is housed in a 20-pin SOIC package with 0.300-inch body width, 1.27 mm pitch, and standard JEDEC MS-013AC footprint. Thermal resistance θJA = 120°C/W (SOIC-20, 2-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Primary 2.7–5.5 V digital supply rail; decoupling capacitor required at pin |
| VSS | Ground | Digital ground reference; must be connected to system GND plane |
| OSC1 / XTAL1 | Oscillator Input | Crystal or external clock input for X-tal oscillator mode; high-impedance CMOS input |
| OSC2 / XTAL2 | Oscillator Output | Crystal amplifier output; connects to crystal second terminal or external clock source |
| PTA0–PTA7 | Port A I/O | 8-bit bidirectional port with individual direction control; PTA0–PTA3 support KBI interrupt |
| PTB0–PTB3 | Port B I/O | 4-bit bidirectional port; PTB0 serves as IRQ1 external interrupt input |
| PTD0–PTD3 | Port D I/O | 4-bit bidirectional port; PTD0–PTD2 support ADC input channels AD0–AD2 |
| RESET | Active-Low Reset | Asynchronous reset input; internal pull-up enabled; triggers POR sequence on falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | Built-in 256-byte ROM enabling serial bootloader operation at 9600–38.4 kbps without external programmer |
| Computer Operating Properly (COP) | Configurable watchdog timer with 16 selectable timeout intervals (0.5 ms to 1.0 s) and software disable capability |
| Low-Voltage Inhibit (LVI) | Hardware brown-out detector asserting reset when VDD drops below 2.5 V ±5%; no external components needed |
| Keyboard Interrupt (KBI) | 8-input scan interface with programmable edge sensitivity and automatic debounce filtering (1–16 ms) |
| Timer Interface Module (TIM) | Dual 16-bit counter/timer with input capture, buffered/unbuffered output compare, and center-aligned PWM support |
Applications
| Appliance Control Panel | Industrial Sensor Node |
|---|---|
|
Use Scenario: Keypad scanning and LED status feedback in microwave oven or washing machine control boards. IC Role / Device Role / Timing Role: Primary MCU executing state-machine logic, reading 4×4 matrix keypad via KBI, driving 7-segment displays through GPIO multiplexing. Use Value: Integrated KBI eliminates external debounce IC; 192 B RAM suffices for real-time UI state buffering; SOIC-20 simplifies rework on high-volume PCBs. |
Use Scenario: Temperature/humidity data acquisition and RS-485 transmission in factory-floor environmental monitors. IC Role / Device Role / Timing Role: ADC controller sampling analog sensors, applying linear calibration coefficients in FLASH, and formatting packets for UART-based communication. Use Value: 8-bit ADC meets ±1°C thermistor resolution requirements; COP ensures reliable recovery from EMI-induced lockup; LVI prevents erratic behavior during power sag. |
| Smart Power Outlet | Medical Diagnostic Handset |
|
Use Scenario: AC load switching and energy metering in UL-certified smart plug designs with local button control. IC Role / Device Role / Timing Role: Real-time zero-crossing detection via TIM input capture, TRIAC gate timing via output compare, and push-button wake-up via IRQ/KBI. Use Value: Hardware timer precision enables ±50 μs phase-angle control; Stop mode draws <1 μA, extending battery life in wireless variants. |
Use Scenario: Portable handheld device acquiring pulse oximetry signals and displaying results on monochrome LCD. IC Role / Device Role / Timing Role: Synchronized dual-channel ADC sampling (LED drive + photodiode), SPI LCD interface, and low-power sleep between measurements. Use Value: On-chip FLASH stores calibration tables per sensor batch; MON ROM allows field firmware updates over UART; SOIC-20 fits compact medical enclosure layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2CSC | RS08 core, 2 KB FLASH, 128 B RAM, no KBI, only 12-pin SOIC | Lacks keyboard scan hardware; insufficient I/O for 4×4 keypad without external shift register | Select when cost-sensitive, low-pin-count designs omit complex UI and require only basic timer/ADC functions. |
| MC9S08QG4CDT | HCS08 core, 4 KB FLASH, 256 B RAM, 16-pin TSSOP, includes SPI/I²C | Higher pin count and added serial interfaces increase PCB area and BOM cost | Prefer when system requires on-board EEPROM communication or multi-drop sensor networking beyond UART. |
Compared with MC68HC908JK3ECDW, MC9RS08KA2CSC offers lower cost but sacrifices KBI and I/O flexibility, while MC9S08QG4CDT adds serial peripherals at the expense of package size and layout complexity - making MC68HC908JK3ECDW optimal for space-constrained, keypad-driven embedded controls.
Availability
MC68HC908JK3ECDW is available at Aetrix Electronics and suitable for appliance control panels, industrial sensor nodes, and smart power outlets requiring stable component supply across long-lifecycle production runs.
Supply support for MC68HC908JK3ECDW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The MC68HC908JK3ECDW belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control tasks where deterministic real-time response and minimal external components are critical.
FAQ
What is the maximum operating frequency of the MC68HC908JK3ECDW?
The MC68HC908JK3ECDW supports a maximum bus clock frequency of 8 MHz. This is achieved either via its internal RC oscillator (calibrated to ±2% over temperature) or with an external crystal connected to OSC1/OSC2 pins. The CPU executes instructions at this bus rate, delivering up to 4 million instructions per second (MIPS) in typical operation.
Does the MC68HC908JK3ECDW include a hardware watchdog timer?
Yes, the MC68HC908JK3ECDW includes a Computer Operating Properly (COP) module - a configurable hardware watchdog timer. It offers 16 selectable timeout periods ranging from 0.5 ms to 1.0 s, and can be disabled via software write to the COPCTL register after reset, enabling safe debug sessions without unintended resets.
Can the MC68HC908JK3ECDW perform in-system programming without external hardware?
Yes, the MC68HC908JK3ECDW contains a 256-byte Monitor ROM (MON) that enables in-system programming via UART. Using the built-in serial bootloader, firmware updates can be performed at standard baud rates (9600–38.4 kbps) without requiring a dedicated programmer - ideal for field upgrades and manufacturing test.
What ADC performance specifications does the MC68HC908JK3ECDW provide?
The MC68HC908JK3ECDW features an 8-bit successive-approximation ADC with 8 selectable input channels. It achieves ±1 LSB integral nonlinearity, 0–VDD input range, and a typical conversion time of 25 μs per sample. Reference voltage is internally tied to VDD, eliminating need for external VREF.
Is the MC68HC908JK3ECDW pin-compatible with other members of the JKx family?
No, the MC68HC908JK3ECDW is not fully pin-compatible with other JKx variants like MC68HC908JK1ECDW or MC68HC908JK8ECDW. While all share the same 20-pin SOIC package, pin functions differ significantly - particularly for ADC inputs, KBI assignments, and TIM channel routing - requiring PCB redesign for substitution.
MC68HC908JK3ECDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 15
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 3.3V
- Data Converters:
- A/D 12x8b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908JK3ECDW FAQ
1.How can I place an order for MC68HC908JK3ECDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908JK3ECDW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC68HC908JK3ECDW reliable?
The price and inventory of MC68HC908JK3ECDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908JK3ECDW is usually 5 days.
3.What payment methods are accepted for MC68HC908JK3ECDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908JK3ECDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908JK3ECDW?
MC68HC908JK3ECDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908JK3ECDW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC68HC908JK3ECDW?
For technical support, including MC68HC908JK3ECDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908JK3ECDW requirements.
6.How does Aetrix verify that MC68HC908JK3ECDW is sourced from the original manufacturer or authorized distributors?
All MC68HC908JK3ECDW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC68HC908JK3ECDW meets industry standards.
7.What is the process for return or replacement of MC68HC908JK3ECDW?
All MC68HC908JK3ECDW units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908JK3ECDW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC68HC908JK3ECDW part is unused and in its original packaging.
Return procedure for MC68HC908JK3ECDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC68HC908JK3ECDW Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
